An optical waveguide includes a lower clad layer, a core layer, and an upper clad layer, wherein the core layer is disposed between the lower clad layer and the upper clad layer. The lower clad layer has a composition including unetchable closed-loop polyimide and plate-shaped clay in a range of 20 wt %-60 wt %. The core layer has a composition including etchable closed-loop polyimide and plate-shaped clay in a range of 20 wt %-60 wt %. The upper clad layer has a composition including an organic material and plate-shaped clay in a range of 20 wt %-60 wt %. The core layer has a refractive index lager than that of the upper clad layer and the lower clad layer.
一种光波导包括下包层、芯层和上包层,其中芯层位于下包层和上包层之间。下包层的成分包括不可蚀刻的闭环聚
酰亚胺和板状粘土,含量范围在 20%-60% 之间。芯层的成分包括可蚀刻闭环聚
酰亚胺和板状粘土,重量百分比为 20%-60%。上覆层的成分包括有机材料和板状粘土,含量在 20%-60% 之间。芯层的折射率低于上覆层和下覆层的折射率。